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SubjectRe: i386/x86_64 segment register issuses (Re: PATCH: Fix x86 segment register access)
On Wed, 30 Mar 2005, H. J. Lu wrote:

> On Wed, Mar 30, 2005 at 07:57:28AM -0800, Linus Torvalds wrote:

>>> There is no such an instruction of "movl %ds,(%eax)". The old assembler
>>> accepts it and turns it into "movw %ds,(%eax)".
>> I disagree. Violently. As does the old assembler, which does not turn
>> "mov" into "movw" as you say. AT ALL.
> I should have made myself clear. By "movw %ds,(%eax)", I meant:
> 8c 18 movw %ds,(%eax)
> That is what the assembler generates, and should have generated, for
> "movw %ds,(%eax)" since Nov. 4, 2004.

Could this be the reason for the reported slowdown in the last six months?


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